No, I think they use meringue powder-based royal icing. I've used Genie's Dream powder for an event, and it stayed in bags for more than a few days without separation. I usually mix royal icing fresh from scratch though, and it can separate faster that Genie's Dream because it does not have the added stabilizers in meringue powder. So maybe try Creative Cookier's Genie's Dream powder, but recognize that, if your icing is very loose, it will separate faster. I hope that helps.